Analysis of Optical Properties for Square, Circular and Hexagonal Photonic Crystal Fiber

This paper presents four rings square, circular, and hexagonal photonic crystal fiber (PCF) geometry for analyzing different optical properties in a wavelength ranging from 800 nm to 1600 nm. These three types of geometry have been used for analyzing Effective area, Propagation constant, Confinement loss and Waveguide dispersion. Silica glass is chosen as background material and the cladding region is made of four air hole layers. COMSOL Multiphysics (v.5) software is used to simulate these proposed PCF geometries. From the numerical analysis, it is found that the effective area is small for hexagonal PCF geometry and large for square PCF geometry (11.827 μm2, 10.588 μm2 and 9.405 μm2 for square, circular, and hexagonal PCF geometry respectively). From the analysis, the Confinement loss is approximately zero at wavelength ranges from 800 nm to 1250 nm and approximately zero waveguide dispersion is achieved from 900 nm to 1500 nm for all the three PCF structures. Again, negative dispersion approximately −30.354 ps/(nm⋅km) is achieved for circular PCF structure at the wavelength of 900 nm.

Alcohol Sensing through Photonic Crystal Fiber at Different Temperature

This paper presents the investigation of relative sensitivity profile of Alcohol through Photonic Crystal fiber at different temperature. Here, 15%, 40%, 60%, 75% of Ethyl Alcohol-water mixture is inserted through the core of Photonic crystal fiber at temperature like 20°C, 25°C and 30°C. COMSOL Multiphysics is used as simulation software and the simulation process is done at wavelength range 600 nm to 1600 nm. From this work, the relative sensitivity is obtained approximately 44, 44.59, 44.85, 45 in percentage at temperature 20°C, 42, 44.2, 44.8, 44.9 in percentage at temperature 25°C, and 42, 43.8, 44.5, 44.85 in percentage at temperature 30°C for 15%, 40%, 60%, 75% of Ethyl Alcohol-water mixture at wavelength 1500 nm respectively. Again, higher sensitivity is achieved when this sensor is operated at lower temperature.

Chemical sensing through photonic crystal fiber:sulfuric acid detection

A photonic crystal fiber(PCF)for sensing of sulfuric acid is designed and analyzed using Comsol Multiphysics.To analyze the sensor performance,0%,10%,20%,30%,40%H2SO4 solution is placed into the fiber separately and then relative sensitivity,confinement loss,birefringence,effective area etc.are investigated for each solution over wavelength ranging from 0.8 to 1.8μm.The sensor structure affords moderately high relative sensitivity and around 63.4%sensitivity is achieved for the highest concentration of H2SO4 at the wavelength 1.5|im inxpolarization direction.This PCF model also shows zero confinement loss for all solutions of H2SO4 over wavelength ranging from 1 to 1.35μm and later on approximately 1.422×10^-17 dB/km confinement loss is found for the highest concentration of H2SO4 at 1.5|im wavelength.Besides,higher birefringence is attained when the concentration of sulfuric acid is lower and it is achieved 7.5×10^-4 at 1.5μm wavelength.Moreover,higher sensing area is achieved at high concentration of sulfuric acid.